Howdy Carol!!
I spoke with a couple of Cast Members and unfortunately, they do not have that information at this time. They typically find out about new information once the change is in place.
We were at Hollywood & Vine this past May and while it would have been great to see Sofia and Doc, we loved meeting June from Disney's Little Einsteins, Jake the Neverland pirate, Handy Manny and Special Agent Oso.
Even if you cannot meet them at
Hollywood & Vine (great choice by the way!), did you know that you can currently see both Princess Sofia and Doc McStuffins at
Disney Junior - Live on Stage! at
Disney's Hollywood Studios?
Plus, there is currently a character meet and greet with Princess Sofia. You do have a few months prior to your visit in March so this information could change. You might check back with us a couple of weeks prior to your visit and we can let you know if there have been any changes.
Thanks so much for your question and please let me know if you need any further information. Have a magical day!!